Tom Rauch wrote:
>The AL-1200, AL-811H, and AL-572 Ameritrons all use a separate broadband
>transformer to invert phase and the first two have a neutralizing probe
>while the 572 has a coaxial slide capacitor for neutralizing.
>
For a schematic, see page 9 of:
http://www.ameritron.com/ameritron/manuals/pdf/al811h.pdf
>This is actually a form of bridge-type neutralization, and you can find
>it described in many books. It has many applications, including grid
>driven systems.
In contrast, the FL-2100Z "neutralization" is very hit-and-miss, because
the amplitude and phase of feedback depends on all three pi-tank
settings.
73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.com/g3sek
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